Superheating apparatus.



No. 736,793. PATENTED AUG. 18, 1903. M.- W. SEWALL.

SUPERHBATING APPARATUS.

APPLICATION FILED JUNE 6. 1902.

PATENTED AUG. 18, 1903.

M. W. SEWALL. SUPBRHEATING APPARATUS.

APPLICATION FILED JUNE 6, 1902.

2 SHEETS-SHEET 2.

No MODEL.

UNITED STATES Patented August 18, 1963.

MINOTT W. SEVALL, OF` ROSELLE, NEW JERSEY.

SUPERHEATING APPARATUS.

SPECIFICATION forming partof` Letters Patent No. 736,793, dated August18,` 1903. Application tiled Tune 6, 1902. Serial No. 110,475. (Nomodel.)

To wZZ whom it may concern:

Be it known that I, MINOTT W. SEWALL, a citizen of the United States,residing at Roselle, in the county of UnionV and State of New Jersey,have invented` certain newand useful Improvem'ents in Separately-FiredSuperheating Apparatus, of which theifollowing is a specification,reference being had therein to the accompanying drawings.

This invention relates .to a separately-fired steam-superheatcr; and itconsists, in combination therewith,of an attemperator arranged betweenthe furnace and the superheater for the purpose of modifying the directheat of the furnace upon the superheating-surfaces, a separatorconnected with the steam-supply, and an economizer located in the pathof the escaping products of combustion forrevaporating any entrainedwaterin the steam from the generator.

In the accompanying-drawings an apparatus embodying my invention isshown detached from a steam-generator.

Figure 1 represents a side View with the economizer arranged above thesuperheater in the same vertical plane, and Fig. 2a side View with theeconomizer located on a horizontal plane with the furnace andattemperator.

In the respective views similar numerals of reference indicatecorresponding parts.

1 is the furnace, 2 the superheater, and 3 the economizer.

4 is the attemperator, located between the furnace 1 and the superheaterin the line of the course of the heated gases from the furnace, asshown. The attemperator is composed of two or more series of water-tubes5, arranged across the top of the furnace and connected at theiropposite ends to manifolds or water-boxes 6, which communicate by meansof a series of interposed nipples 7, the upper manifold connecting withanother manifold 8 at the front by means of a series of tubes 9 and atthe rear to the steam and water drum 10 by a series of tubes 11. The

. drum 10 and front manifold 8 communicate the attemperator.

ofa series of tubes or nipples 14. The interior of the drum 10 is`provided with perforated partitions or baffles 15 to keep thecirculating water in the drum practically separated from the steam-spaceand from the steam-inlet from the generator and steamries of tubes 19and cross-box 2O at one end and with tubes 21 from said cross-boxwiththe drum l0. The headers at the other end of the economizer communicatedirectly with the drum 10 through a series of tubes 22. A mud-drum 23 isalso provided at the lower end of the economizer. The water circulationof the economizer is the same as 'through the attemperator, as indicatedby the arrows in the respective figures. In the relative arrangement ofthe economi'zer shown in Fig. 1 a separate drum 24 is supplied.

The steam-outlet of the superheater is indicated by the numeral 25 inthe respective iigures.

The course of the heated gases from the furnace to the chimney or-uptake is clearly indicated bythe curved arrows. The uptake 26 is'supplied .with a damper 27, andl the course of the gases is regulated bythe partitions or baffles 28 in the usual way.

In the construction of the attemperator 4 only two rows of the tubes 5are used, which are deemed sufficient for the purpose of this invention,this surface not being intended as a heating-surface for the generationof a steam-supply to the superheater, its proportion to the amount ofgrate -surface shown rendering it inadequate for such purposes, thesuperheating-surface being designed vapproximately in a ratio of iive toone of a steamgenerating surface.

The superheater 2 on account of its large comparative size will with theordinary means of firing be sensitive to the iooding of the furnace withcold air during the pe#- IOO , the attemperator, as shown in Fig. 2.

:riod of working the fire, and to avoid this I have added devices toprevent the entrance of the air at such time. These devices consist of ahopper 29, through which the coal is fed, located below theconnection-door 30 of the superheater, as shown in Fig. 1, or of Thehopper` is provided near its base with a revolving feeder 31, havingprojecting blades 32 and a swinging gate 33, operated by the revolvingfeeder to close the base of the hopper during the feeding of the coal tothe chute 34, leading to the furnace. The gate 33 above the feeder alsoserves to distribute the coal as the feeder revolves, and thus keeps thecoal from lodging in the hopper. With this device the coal will be fedcontinuously and after coking at the front of the furnace may be spreadover the grate 35 by suitable tools passed through small openings in thefurnace-door 36, which are normally closed by hinged coverings 36 37 38.This feeding and {lire-regulating device is not claimed herein, but isreserved for the subject-matter of a separate application.

,The operation of the apparatus will be readily understood from theforegoing description and inspection of the drawings, the attemperatorand economizer being kept supplied with Water by suitable feedconnections (shown in the drum 10, Figs. l and 2) and by an independentor connected feed in the drum of the economizer, as shown in Fig. 1, thecirculation following the direction shown the combination therewith of aseparator con-` nectedwith the steam-supply, an attemperator incirculatory communication therewith, and an economizer located in thecourse of the escaping products of combustion.

3. In a separatelyred steam-superheater, the combination therewith of aseparator connected with the steam-supply, an attemperator invcirculatory communication with the separator and an economizer also incirculatory communication with the separator, all located in the courseof the escaping products of combustion.

In testimony whereof I afx my signature in presence of two Witnesses.

MINOTT W. SEWALL.

Witnesses:

CHAs. W. FORBES, CHARLES HANIMANN.

